Factorise les utilisant A= x2 - 4 = B = 9 - x2 = C= 25 - x2 = D= 16 - 9x2 = E=4 - 64x2 = F = (x + 2)2 - 9 = G= 16-(3x + 4)2 = +3) Je comprend rien à tout sa que

bonjour,

A= x² - 4 = (x-2)(x+2

B = 9 - x² = (3-x)(3+x)

C= 25 - x² = (5-x) (5+x)

D= 16 - 9x² = (4-3x) (4+3x)

E=4 - 64x² = (2-8x) (2+8x)

F = (x + 2)² - 9 = (x+2-3)(x+2+3) = (x-1) ( x+5)

G= 16-(3x + 4)² = (4-3x+4) ( 4+3x+4)  = (-3x +8) ( 3x+8)

a² -b² = (a+b) (a-b)